Method for predicting remaining service life of urea pump and related apparatus

Abstract

A method for predicting a remaining service life of a urea pump is provided. The method includes monitoring a pressure build-up duration, acquiring an operating condition degradation duration based on the pressure build-up duration, and subtracting a degradation duration from a calibrated remaining service life of the urea pump to obtain a prediction result of the remaining service life of the urea pump. The pressure build-up duration is a duration of a successful pressure build-up process during a latest driving cycle of an engine provided with the urea pump. The successful pressure build-up process is a process during which a pump pressure value of the urea pump increases from a first preset value to a second preset value. The calibrated remaining service life is obtained by subtracting an operating duration of the urea pump from a calibrated service life of the urea pump.

1 . A method for predicting a remaining service life of a urea pump, comprising:
 monitoring a pressure build-up duration, wherein the pressure build-up duration is a duration of a successful pressure build-up process during a latest driving cycle of an engine provided with the urea pump, and the successful pressure build-up process is a process during which a pump pressure value of the urea pump increases from a first preset value to a second preset value;   acquiring an operating condition degradation duration based on the pressure build-up duration, wherein the operating condition degradation duration is positively correlated with the pressure build-up duration; and   subtracting a degradation duration from a calibrated remaining service life of the urea pump to obtain a prediction result of the remaining service life of the urea pump, wherein the calibrated remaining service life is obtained by subtracting an operating duration of the urea pump from a calibrated service life of the urea pump, and the degradation duration comprises the operating condition degradation duration.   
     
     
         2 . The method according to  claim 1 , wherein the acquiring an operating condition degradation duration based on the pressure build-up duration comprises:
 acquiring a set of historical pressure build-up durations, wherein the historical pressure build-up durations are durations of successful pressure build-up processes during historical driving cycles of the engine;   determining a historical pressure build-up duration corresponding to a preset quantile in the set of the historical pressure build-up durations as a pressure build-up threshold; and   acquiring the operating condition degradation duration based on the pressure build-up duration in response to the pressure build-up duration exceeding the pressure build-up threshold.   
     
     
         3 . The method according to  claim 2 , wherein the acquiring the operating condition degradation duration based on the pressure build-up duration in response to the pressure build-up duration exceeding the pressure build-up threshold comprises:
 acquiring an operating condition degradation factor based on the pressure build-up duration, wherein the operating condition degradation factor is positively correlated with the pressure build-up duration; and   determining a product of the operating condition degradation factor and a service life of the urea pump per driving cycle as the operating condition degradation duration, wherein the service life of the urea pump per driving cycle is determined based on the calibrated service life and a preset calibrated start-stop count, and the calibrated start-stop count indicates a maximum value of the start-stop count throughout a lifecycle of the urea pump.   
     
     
         4 . The method according to  claim 1 , further comprising:
 acquiring a B10 service life of the urea pump; and   correcting the B10 service life based on a Weibull distribution function and historical data to obtain the calibrated service life of the urea pump.   
     
     
         5 . The method according to  claim 1 , wherein the degradation duration further comprises a maintenance degradation duration, and the method further comprises:
 acquiring a preset parameter interval, wherein the parameter interval comprises at least one of a mileage interval, an operating duration interval and a duration interval since factory shipment, and any one of the parameter intervals indicate a usage degree of the urea pump;   determining an interval within a historical parameter interval excluding a value of a parameter in a maintenance record as a target parameter interval, wherein the historical parameter interval comprises an interval with an upper limit less than a real-time value, and the maintenance record comprises the value of the parameter corresponding to a maintenance time instant;   determining a maintenance degradation factor of the target parameter interval based on the usage degree indicated by the target parameter interval, wherein the maintenance degradation factor is positively correlated with the usage degree;   determining an interval degradation duration of the target parameter interval based on the maintenance degradation factor of the target parameter interval; and   summing up the interval degradation durations of all the target parameter intervals to obtain the maintenance degradation duration.   
     
     
         6 . The method according to  claim 5 , wherein the determining an interval within a historical parameter interval excluding a value of a parameter in a maintenance record as a target parameter interval comprises:
 monitoring the real-time value of the parameter, wherein the parameter comprises at least one of a mileage, the operating duration and a duration since factory shipment;   acquiring the maintenance record in response to the real-time value of any one of the parameters reaching the upper limit of the corresponding parameter interval; and   determining the interval within the historical parameter interval excluding the value of the parameter in the maintenance record as the target parameter interval.   
     
     
         7 . The method according to  claim 6 , further comprising:
 generating and sending a preset alarm command in response to the real-time value of the parameter meeting a preset alarm condition, wherein   the alarm condition comprises that the parameter interval between the real-time value of the parameter and an upper limit of a real-time parameter interval is less than a preset interval threshold, and the real-time parameter interval is a parameter interval comprising the real-time value of the parameter.   
     
     
         8 . The method according to  claim 7 , wherein the determining a maintenance degradation factor of the target parameter interval based on the usage degree indicated by the target parameter interval comprises:
 sorting the parameter intervals based on the upper limits of the intervals in an ascending order to obtain an interval sequence, and determining an ordinal position of the target parameter interval within the interval sequence as the usage degree of the target parameter interval; and   acquiring the maintenance degradation factor of the target parameter interval based on the usage degree of the target parameter interval, wherein the maintenance degradation factor is positively correlated with the usage degree.   
     
     
         9 . The method according to  claim 3 , further comprising:
 monitoring a real-time start-stop count of the urea pump,   wherein the subtracting a degradation duration from a calibrated remaining service life of the urea pump to obtain a prediction result of the remaining service life of the urea pump comprises:   subtracting the degradation duration from the calibrated remaining service life of the urea pump to obtain the prediction result of the remaining service life of the urea pump in response to the real-time start-stop count of the urea pump not exceeding the calibrated start-stop count,   wherein the method further comprises:   acquiring the prediction result of the remaining service life of the urea pump based on the real-time start-stop count of the urea pump and a difference obtained by subtracting the degradation duration from the calibrated remaining service life in response to the real-time start-stop count exceeding the calibrated start-stop count.   
     
     
         10 . An apparatus for predicting a remaining service life of a urea pump, comprising:
 a pressure build-up duration monitoring unit, configured to monitor a pressure build-up duration, wherein the pressure build-up duration is a duration of a successful pressure build-up process during a latest driving cycle of an engine provided with the urea pump, and the successful pressure build-up process is a process during which a pump pressure value of the urea pump increases from a first preset value to a second preset value;   an operating condition degradation unit, configured to acquire an operating condition degradation duration based on the pressure build-up duration, wherein the operating condition degradation duration is positively correlated with the pressure build-up duration; and   a prediction result acquisition unit, configured to subtract a degradation duration from a calibrated remaining service life of the urea pump to obtain a prediction result of the remaining service life of the urea pump, wherein the calibrated remaining service life is obtained by subtracting an operating duration of the urea pump from a calibrated service life of the urea pump, and the degradation duration comprises the operating condition degradation duration.   
     
     
         11 . A device for predicting a remaining service life of a urea pump, comprising a memory and a processor, wherein
 the memory is configured to store a program; and   the processor is configured to execute the program to perform the method for predicting a remaining service life of a urea pump according to  claim 1 .   
     
     
         12 . A readable storage medium storing a computer program, wherein the computer program performs, when being executed by a processor, the method for predicting a remaining service life of a urea pump according to  claim 1 .